Solvent extraction and distillation technique for purification o

Details Solvent extraction and distillation technique for purification o Solvent extraction and distillation technique for purification o

1974-06-05

1976-10-19

Gotts, Lewis

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

203 43, C07C119042

Patent

active

039870758

ABSTRACT:
Alkyl substituted benzene is used as a solvent to extract organic isocyanates from crude reaction mixtures containing organic isocyanates. The crude reaction mixture is admixed with the alkyl substituted benzene solvent and heated to a temperature in the range from 130.degree. C. to about 280.degree. C. for a solvent extraction period ranging from about 0.5 to about 24 hours. The alkyl substituents on the benzene contain between 1 and 15 carbon atoms and sufficient substituents to provide at least two carbon atoms in the substituents.

REFERENCES:
patent: 3211631 (1965-10-01), Fuchs
patent: 3816496 (1974-06-01), Schnabel

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